KVM: arm64: vgic-its: Test for valid IRQ in MOVALL handler

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-427.28.1.el9_4
commit-author Oliver Upton <oliver.upton@linux.dev>
commit 85a71ee

It is possible that an LPI mapped in a different ITS gets unmapped while
handling the MOVALL command. If that is the case, there is no state that
can be migrated to the destination. Silently ignore it and continue
migrating other LPIs.

	Cc: stable@vger.kernel.org
Fixes: ff9c114 ("KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE")
	Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240221092732.4126848-3-oliver.upton@linux.dev
	Signed-off-by: Marc Zyngier <maz@kernel.org>
(cherry picked from commit 85a71ee)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/arm64/kvm/vgic/vgic-its.c

@@ -1435,6 +1435,8 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,
 
 	for (i = 0; i < irq_count; i++) {
 		irq = vgic_get_irq(kvm, NULL, intids[i]);
+		if (!irq)
+			continue;
 
 		update_affinity(irq, vcpu2);